Cushion for a bathtub



FIG. 1 is an exploded front, top and side perspective view of thecushion for a bathtub showing our new design;

FIG. 2 is a front end elevational view thereof;

FIG. 3 is a rear end elevational view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is a side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The ornamental design for a cushion for a bathtub, as shown.